Population aging refers to the relatively faster growth of the older population compared to the younger population and the resultant shifts in the age distribution of the population toward older ages. Population aging is commonly measured as an increasing median age or a rising share of the population above a certain age, such as 65.
All Census Bureau demographic surveys and the decennial census collect information about the U.S. older population. Other countries also collect data on the older population through household-based surveys and population and housing censuses.
This section includes data and publications on population aging in both the United States and the world as well as information on older population’s characteristics.